METHOD FOR IMPROVING EFFICIENCY FACTOR DURING OPERATION OF THREE-PHASE ASYNCHRONOUS MOTORS OF ELECTRIC DRIVES WITH VARIABLE LOAD Russian patent published in 2012 - IPC G01R31/34 

FIELD: electricity.

SUBSTANCE: when load moments are less than rated, lowering of voltage supplied to stator is carried out according to regulation curve of electric motor, and this curve is written in digital form to random access memory. Voltage supplied to electric motor stator is measured in digital form and written to the first general-purpose register of microprocessor. Rotation speed of electric motor is measured in digital form and written to random access memory. From regulation curve written in random access memory, required voltage is determined in digital form and is written to the second general-purpose register. Calculation of difference of codes written in the first and second general-purpose registers of microcontroller is executed according to program. Obtained difference is converted, and new required value of voltage supplied to electric motor stator is set.

EFFECT: higher efficiency factor during operation of three-phase asynchronous electric motors of electric drives with variable load.

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